Many players interrogate the display over HDMI to determine the resolution of the display and this doesn't always work.
If the display misses the interrogation message or doesn't support resolution interrogation, it won't respond. Or the display may respond with a format the player doesn't support (such as 1366 x 768 displays that report that they are, indeed, 1366 x 768 when the only standard HD signal formats are 720p, 1080i and 1080p.
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